[INFO] fetching crate mmapio 0.9.0...
[INFO] checking mmapio-0.9.0 against master#3e826bb11228508fbe749e594038d6727208aa94 for pr-82322
[INFO] extracting crate mmapio 0.9.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate mmapio 0.9.0 on toolchain 3e826bb11228508fbe749e594038d6727208aa94
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mmapio 0.9.0
[INFO] finished tweaking crates.io crate mmapio 0.9.0
[INFO] tweaked toml for crates.io crate mmapio 0.9.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate mmapio 0.9.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d6d06eff718e47899ae04ac283b485f202a097cb6a030148d1d60d3cb7ea5361
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d6d06eff718e47899ae04ac283b485f202a097cb6a030148d1d60d3cb7ea5361", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d6d06eff718e47899ae04ac283b485f202a097cb6a030148d1d60d3cb7ea5361", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6d06eff718e47899ae04ac283b485f202a097cb6a030148d1d60d3cb7ea5361", kill_on_drop: false }`
[INFO] [stdout] d6d06eff718e47899ae04ac283b485f202a097cb6a030148d1d60d3cb7ea5361
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+3e826bb11228508fbe749e594038d6727208aa94" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b4187ab78e3b73495e2eb77c39ec3740da3adcd92236329ee946f7f8df80eb88
[INFO] running `Command { std: "docker" "start" "-a" "b4187ab78e3b73495e2eb77c39ec3740da3adcd92236329ee946f7f8df80eb88", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking mmapio v0.9.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stdout] warning: unused variable: `path`
[INFO] [stdout]     --> src/lib.rs:1197:13
[INFO] [stdout]      |
[INFO] [stdout] 1197 |         let path = tempdir.path().join("mmap");
[INFO] [stdout]      |             ^^^^ help: if this is intentional, prefix it with an underscore: `_path`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/lib.rs:1200:13
[INFO] [stdout]      |
[INFO] [stdout] 1200 |         let mut file = OpenOptions::new()
[INFO] [stdout]      |             ----^^^^
[INFO] [stdout]      |             |
[INFO] [stdout]      |             help: remove this `mut`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/lib.rs:1221:17
[INFO] [stdout]      |
[INFO] [stdout] 1221 |             let mut file = OpenOptions::new()
[INFO] [stdout]      |                 ----^^^^
[INFO] [stdout]      |                 |
[INFO] [stdout]      |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:864:9
[INFO] [stdout]     |
[INFO] [stdout] 864 |         file.set_len(0);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.06s
[INFO] running `Command { std: "docker" "inspect" "b4187ab78e3b73495e2eb77c39ec3740da3adcd92236329ee946f7f8df80eb88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4187ab78e3b73495e2eb77c39ec3740da3adcd92236329ee946f7f8df80eb88", kill_on_drop: false }`
[INFO] [stdout] b4187ab78e3b73495e2eb77c39ec3740da3adcd92236329ee946f7f8df80eb88